Merge pull request #18 from valbeat/docs/add-codecov-badge

Add Codecov badge to README

Author: valbeat

README.md

@@ -1,6 +1,7 @@
 # PHP Result
 
 ![Packagist Version](https://img.shields.io/packagist/v/valbeat/result)
+[![codecov](https://codecov.io/gh/valbeat/php-result/branch/main/graph/badge.svg)](https://codecov.io/gh/valbeat/php-result)
 
 A Result type implementation for PHP inspired by Rust's `Result<T, E>` type.